What did you do before this crash: Hosting Serum 64-bit VSTi (v1.20b9) and sliding the mouse pointer up and down MM's on-screen virtual keyboard.

*** 0 called from 00007FF654BFA6FE
*** 1 called from 00007FF654BFAA49
*** 2 called from 00007FFE8FD34F77
*** 3 called from 00007FFE92A3ED1B
*** 4 called from 00007FFE92A26BD6
*** 5 called from 00007FFE92A3AB9D
*** 6 called from 00007FFE929D9913
*** 7 called from 00007FFE92A39CBA
*** 8 called from 000000000801EFC4
*** 9 called from 00000000080239EE
*** 10 called from 0000000008023C5C
*** 11 called from 0000000008078FAA
*** 12 called from 000000000806D2B4
*** 13 called from 0000000008057FC3
*** 14 called from 0000000008059DCF
*** 15 called from 000000000807DD07
*** 16 called from 00007FF654A3828A
*** 17 called from 00007FF654B53D21
*** 18 called from 00007FF654B4F57F
*** 19 called from 00007FF654B4D151
*** 20 called from 00007FF654B4A831
*** 21 called from 00007FF654A53E79
*** 22 called from 00007FF654A6201C
*** 23 called from 00007FF654C12A8B
*** 24 called from 00007FF654C12B3F
*** 25 called from 00007FFE90358364
*** 26 called from 00007FFE929F70D1